Insulation resistance tester



FIG. 1 is a perspective view of an insulation resistance tester showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a left side view with the front cover thereof being opened;

FIG. 9 is a front view with the front cover thereof being opened and all the display elements on the panel being on; and,

FIG. 10 is a perspective view showing the tester with its cover opened and probes, shown in phantom line, accommodated in the tester. 

The ornamental design for an insulation resistance tester, as shown and described. 